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@@ -0,0 +1,99 @@
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+settings = require("settings-sharelatex")
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+request = require("request")
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+logger = require("logger-sharelatex")
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+
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+generate_client_id = ->
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+ # from http://stackoverflow.com/questions/105034
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+ 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace /[xy]/g, (c) ->
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+ r = Math.random() * 16 | 0
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+ v = if c == 'x' then r else r & 0x3 | 0x8
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+ v.toString 16
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+
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+_request_uri = (endpoint, params) ->
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+ query_string = []
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+ e = encodeURIComponent
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+ for key of params
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+ if params.hasOwnProperty(key)
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+ vals = params[key]
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+ if Object::toString.call(vals) != '[object Array]'
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+ vals = [ vals ]
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+ i = 0
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+ while i < vals.length
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+ query_string.push e(key) + '=' + e(vals[i])
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+ i += 1
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+ if query_string.length
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+ endpoint += '?' + query_string.join('&')
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+ endpoint
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+
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+_request = (uri, params, callback)->
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+ opts =
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+ uri:_request_uri(uri, params)
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+ json:true
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+ timeout:1000
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+ request.get opts, (err, res, body)->
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+ callback err, body
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+
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+module.exports = sixpack =
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+
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+ client: (user_id)->
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+ client = new sixpack.Session(user_id, settings.apis.sixpack.url)
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+ return client
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+
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+ Session : (client_id, base_url, ip_address, user_agent) ->
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+
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+ @client_id = client_id or sixpack.generate_client_id()
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+ @base_url = base_url or sixpack.base_url
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+
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+ participate: (experiment_name, alternatives, force, callback) =>
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+ if typeof force == 'function'
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+ callback = force
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+ force = null
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+ if !/^[a-z0-9][a-z0-9\-_ ]*$/.test(experiment_name)
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+ return callback(new Error('Bad experiment_name'))
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+ if alternatives.length < 2
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+ return callback(new Error('Must specify at least 2 alternatives'))
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+ i = 0
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+ while i < alternatives.length
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+ if !/^[a-z0-9][a-z0-9\-_ ]*$/.test(alternatives[i])
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+ return callback(new Error('Bad alternative name: ' + alternatives[i]))
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+ i += 1
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+ params =
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+ client_id: @client_id
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+ experiment: experiment_name
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+ alternatives: alternatives
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+
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+ if force != null and _in_array(alternatives, force)
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+ return callback(null,
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+ 'status': 'ok'
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+ 'alternative': 'name': force
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+ 'experiment':
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+ 'version': 0
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+ 'name': experiment_name
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+ 'client_id': @client_id)
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+
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+ _request @base_url + '/participate', params, (err, res) ->
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+ if err?
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+ res =
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+ status: 'failed'
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+ error: err
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+ alternative: name: alternatives[0]
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+ callback null, res
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+
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+ convert: (experiment_name, callback)=>
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+ if !/^[a-z0-9][a-z0-9\-_ ]*$/.test(experiment_name)
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+ return callback(new Error('Bad experiment_name'))
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+ params =
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+ client_id: @client_id
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+ experiment: experiment_name
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+ if @ip_address
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+ params.ip_address = @ip_address
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+ if @user_agent
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+ params.user_agent = @user_agent
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+ _request @base_url + '/convert', params, (err, res) ->
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+ if err?
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+ res =
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+ status: 'failed'
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+ error: err
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+ callback null, res
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+
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+
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Henry Oswald